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The villainess is getting married to the villain?!Lily, a former villainess was killed by the man sh...
Contract engagement, not a marriage, but I'm putting it here.
Our FML wakes up after being sentenced to death via poison and finds herself inside a book, where the characters all have the same face and names as people from her original world. She recruits the villain of the book to help her deal with some family issues, and to help him not become "evil".